Solar powered generating system, meaning that there is no need to ever change batteries
Caliber V147
Powered by light energy
Accuracy: +/- 15 seconds per month (between 5°C and 35°C)

Specifications
Glass Material:  Sapphire crystal
Case: Stainless steel
Screw back. Screw-down crown
SPECIAL EDITION on the case back
Size: 38.5 mm,
Thickness: 10.6 mm
Weight:
Water resistance: 200m
Band: Stainless steel bracelet
Three-fold clasp with secure lock
Dial: Black